[skydhash]

There’s zulip https://zulip.com/

[esseph]

That's a SaaS / Product.

https://zulip.com/self-hosting/

Similar to the GitLab model.

Example limitations:

> Mobile notifications without limitation for eligible communities

> Mobile notifications for up to 10 users for other organizations

[skydhash]

The app is open-source, so I guess it would be OK to deploy it yourself and thus register for your own notifications pipeline.

[odo1242]

There’s also Mattermost